EP1653150B1 - Light emitting diode module for automotive headlamp - Google Patents
Light emitting diode module for automotive headlamp Download PDFInfo
- Publication number
- EP1653150B1 EP1653150B1 EP05022759A EP05022759A EP1653150B1 EP 1653150 B1 EP1653150 B1 EP 1653150B1 EP 05022759 A EP05022759 A EP 05022759A EP 05022759 A EP05022759 A EP 05022759A EP 1653150 B1 EP1653150 B1 EP 1653150B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- light gathering
- automotive headlamp
- light emitting
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4298—Coupling light guides with opto-electronic elements coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/151—Light emitting diodes [LED] arranged in one or more lines
- F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/24—Light guides
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- This invention relates to automotive headlights and more particularly to such headlights employing light emitting diodes (hereafter, LED or LEDs). Still more particularly it relates to a headlight using multiple LEDs but emulating a point source, allowing the light source to be used with, for example, a projector lens.
- LED or LEDs light emitting diodes
- LED light sources have produced a desire to use such light sources in automotive applications.
- these applications have been limited to stop lights and taillights and internal illumination.
- LEDs capable of emitting white light have suggested that they might also be used for headlights.
- U.S. Patent No. 6,406,172 teaches the employment of multiple red, green and blue emitting LEDs arranged in a matrix, whose light is blended to emit a version of white light.
- the light output can also be varied by computer control and can accommodate directional variation by the vehicle with which they are used.
- German patent application publication DE 10149837 furthermore describes a light guide having several fingers that gather light from an LED array and merge together to form a single output endface, whereby each finger is associated with a single light emitter.
- US patent application publication US 2004 0149998 describes an automotive headlight assembly using a plurality of fibres gathering light from a two dimensional array of LED dies, whereby each fibre is associated with a single light emitter. The fibres further being bundled to form a single light output area within the headlight housing.
- Newer versions of white light emitting LEDs employ blue and ultra violet-emitting LED sources in combination with a yellow light emitting phosphor, which blends the output into a white light
- a lamp has recently been proposed that comprises a housing having a base with a circumferential wall arranged about a longitudinal axis; a hollow body projecting from the base that is symmetrically arrayed about the longitudinal axis; a light guide having a single output end arrayed along the longitudinal axis and having a plurality of radially extending arms, each of the arms having an input end; and a like plurality of light emitting diodes operatively positioned with respect to the radially extending arms.
- the light emitting diodes are arrayed about the circumferential wall. This latter approach is described in Provisional Patent Application S.N. 60/612,080, filed 09/22/2004 (see EP1640753 ).
- the arms of the guide generally encompass only a single LED. Accordingly, it would be an improvement to provide a light gathering module, and a lamp employing the light gathering module, wherein each arm of the module encompasses multiple LEDs, thus increasing the light output while reducing the number of optical elements required.
- an automotive headlamp comprising the features specified in claim 1, whereby the unit is small and compact and provides an efficient light source for a vehicle headlamp.
- Fig. 1 is a perspective view of an embodiment of a light gathering module in accordance with an aspect of the invention
- Fig. 2 is a perspective view of an LED housing that can be used with the invention
- Fig. 3 is an elevational view, partially in section, of the LED housing and an arm of the light gathering module
- Fig. 4 is a diagrammatic view of an automotive headlamp
- Fig. 5 is an end view of the LED housing illustrating some desired relationships.
- a light gathering module 10 having a unitary body 12 with a first end 14 comprising a single light transmitting surface 16 and a second end 18 having a plurality of arms 20, each arm 20 having an independent light gathering terminus 22 that is rectangular.
- the first end 14 of the body also is rectangular.
- the light gathering module 10 can be fabricated from acrylic, plastic, glass or other suitable material and preferably has no cladding so that light output is maximized. By fabricating the light gathering 10 from a single piece, the necessity of orientating a large number of individual fibers is eliminated.
- Light emitting diodes 24 are positioned in a housing 35 that is associated with each termini 22.
- the LEDs can be individual LEDs packaged as a unit, as shown in Fig. 2 and 3 , or they could be in a single package with multiple chips.
- the spacing of the LEDs can also be regulated by putting the LEDs closer together by wire-bonding to the side.
- the LEDs can be mounted directly to a board such as a ceramic or metal-core printed circuit board.
- each diode chip is 1 mm square, as indicated by "C" in Fig. 5 , and five chips are arranged longitudinally across 5.4 mm, preferably with spacing between chips of about 100 um.
- the light guide arms have a length "L" of 6 to 7 mm and a width "W" of approximately 2 mm. Housings 35 with more or less than five chips can, of course, by utilized if necessary.
- the housings 35 are preferably mounted upon a thermally transmissive ceramic 37, which, in turn, is mounted upon a heat sink, which can be aluminum or copper.
- An optical encapsulant 38 fills the space between the walls 40 of the housing 35 and extends a distance "D" above the surface of the LED. To insure good optical coupling, "D" should be small relative to "W”.
- An automotive headlamp 30 including the light gathering module 10 is shown diagrammatically in Fig. 4 and has a housing 32 with a lens 34 in a front portion 44 thereof
- the lens 34 is a projector lens.
- the light gathering module 10 is positioned in the housing 32 with the first end 14 being operatively associated with the lens 34.
- the output end of module 12 is located near a focal point of the lens 34.
- the LEDs ideally emit white light, such as from known LEDs having surface emission combined with a phosphor; however, other colors can be utilized.
- Electrical connections to the LEDs can be made in any suitable manner, including via a printed circuit board.
- the size and thermal capabilities of the heat sink will depend upon multiple factors, including the efficacy of the LEDs and the amount of power necessary to drive them.
- a viable headlamp for a vehicle that is economical to manufacture and has superior light gathering capabilities due to the configuration of the light gathering module.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Led Device Packages (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
- This application claims priority from Provisional Patent Application Serial No.
60/620,933, filed 10/21/2004 - This invention relates to automotive headlights and more particularly to such headlights employing light emitting diodes (hereafter, LED or LEDs). Still more particularly it relates to a headlight using multiple LEDs but emulating a point source, allowing the light source to be used with, for example, a projector lens.
- The long-life and appreciable ruggedness of LED light sources has produced a desire to use such light sources in automotive applications. Currently, these applications have been limited to stop lights and taillights and internal illumination. Recently developed LEDs capable of emitting white light have suggested that they might also be used for headlights. For example,
U.S. Patent No. 6,406,172 teaches the employment of multiple red, green and blue emitting LEDs arranged in a matrix, whose light is blended to emit a version of white light. The light output can also be varied by computer control and can accommodate directional variation by the vehicle with which they are used. -
German patent application publication DE 10149837 furthermore describes a light guide having several fingers that gather light from an LED array and merge together to form a single output endface, whereby each finger is associated with a single light emitter. - US patent application publication
US 2004 0149998 describes an automotive headlight assembly using a plurality of fibres gathering light from a two dimensional array of LED dies, whereby each fibre is associated with a single light emitter. The fibres further being bundled to form a single light output area within the headlight housing. - Newer versions of white light emitting LEDs employ blue and ultra violet-emitting LED sources in combination with a yellow light emitting phosphor, which blends the output into a white light
- A lamp has recently been proposed that comprises a housing having a base with a circumferential wall arranged about a longitudinal axis; a hollow body projecting from the base that is symmetrically arrayed about the longitudinal axis; a light guide having a single output end arrayed along the longitudinal axis and having a plurality of radially extending arms, each of the arms having an input end; and a like plurality of light emitting diodes operatively positioned with respect to the radially extending arms. In a preferred embodiment of the invention the light emitting diodes are arrayed about the circumferential wall. This latter approach is described in Provisional Patent Application S.N.
60/612,080, filed 09/22/2004 EP1640753 ). While it provides a workable solution, the arms of the guide generally encompass only a single LED. Accordingly, it would be an improvement to provide a light gathering module, and a lamp employing the light gathering module, wherein each arm of the module encompasses multiple LEDs, thus increasing the light output while reducing the number of optical elements required. - It is, therefore, an object of the invention to obviate the disadvantages of the prior art.
- It is another object of the invention to provide a light guide, or light gathering module, that can encompass multiple LEDs.
- It is another object of the invention to provide a standard LED light source with a defined emitting surface independent of the number of LEDs.
- These objects are accomplished, by an automotive headlamp comprising the features specified in claim 1, whereby the unit is small and compact and provides an efficient light source for a vehicle headlamp.
-
Fig. 1 is a perspective view of an embodiment of a light gathering module in accordance with an aspect of the invention; -
Fig. 2 is a perspective view of an LED housing that can be used with the invention; -
Fig. 3 is an elevational view, partially in section, of the LED housing and an arm of the light gathering module; -
Fig. 4 is a diagrammatic view of an automotive headlamp; and -
Fig. 5 is an end view of the LED housing illustrating some desired relationships. - For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims taken in conjunction with the above-described drawings.
- Referring now to the drawings with greater particularity, there is shown in
Fig. 1 alight gathering module 10 having aunitary body 12 with afirst end 14 comprising a singlelight transmitting surface 16 and asecond end 18 having a plurality ofarms 20, eacharm 20 having an independentlight gathering terminus 22 that is rectangular. In a preferred embodiment of the invention, thefirst end 14 of the body also is rectangular. Thelight gathering module 10 can be fabricated from acrylic, plastic, glass or other suitable material and preferably has no cladding so that light output is maximized. By fabricating thelight gathering 10 from a single piece, the necessity of orientating a large number of individual fibers is eliminated. -
Light emitting diodes 24 are positioned in ahousing 35 that is associated with eachtermini 22. The LEDs can be individual LEDs packaged as a unit, as shown inFig. 2 and 3 , or they could be in a single package with multiple chips. The spacing of the LEDs can also be regulated by putting the LEDs closer together by wire-bonding to the side. Further, the LEDs can be mounted directly to a board such as a ceramic or metal-core printed circuit board. In a preferred embodiment of the invention each diode chip is 1 mm square, as indicated by "C" inFig. 5 , and five chips are arranged longitudinally across 5.4 mm, preferably with spacing between chips of about 100 um. The light guide arms have a length "L" of 6 to 7 mm and a width "W" of approximately 2 mm.Housings 35 with more or less than five chips can, of course, by utilized if necessary. - The
housings 35 are preferably mounted upon a thermally transmissive ceramic 37, which, in turn, is mounted upon a heat sink, which can be aluminum or copper. - An
optical encapsulant 38 fills the space between thewalls 40 of thehousing 35 and extends a distance "D" above the surface of the LED. To insure good optical coupling, "D" should be small relative to "W". - An
automotive headlamp 30 including thelight gathering module 10 is shown diagrammatically inFig. 4 and has a housing 32 with alens 34 in a front portion 44 thereof Preferably, thelens 34 is a projector lens. Thelight gathering module 10 is positioned in the housing 32 with thefirst end 14 being operatively associated with thelens 34. Preferably the output end ofmodule 12 is located near a focal point of thelens 34. - For purposes of a vehicle headlamp or backup light, the LEDs ideally emit white light, such as from known LEDs having surface emission combined with a phosphor; however, other colors can be utilized.
- Electrical connections to the LEDs (not shown) can be made in any suitable manner, including via a printed circuit board. The size and thermal capabilities of the heat sink will depend upon multiple factors, including the efficacy of the LEDs and the amount of power necessary to drive them.
- Accordingly, there is provided a viable headlamp for a vehicle that is economical to manufacture and has superior light gathering capabilities due to the configuration of the light gathering module.
- While there have been shown and described what are present considered to be the preferred embodiments of the invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope of the invention as defined by the appended claims.
Claims (4)
- An automotive headlamp (30) comprising
a housing (32),
a lens (34) in a front portion (44) of said housing (32), and a light gathering module (10) which has a plurality of light guide arms (20), each arm (20) having an independent light gathering terminus (22),
characterized in that
the light gathering module (10) is positioned in said housing (32), that
the light gathering module (10) has a unitary body (12) with a first end (14) comprising a single light transmitting surface (16) and a second end (18) comprising the plurality of light guide arms (20), that
each independent light gathering terminus (22) is rectangular, that
a plurality of light emitting diodes (24) is associated with each terminus (22), and that
said first end (14) is operatively associated with said lens (34). - The automotive headlamp (30) of claim 1 wherein said first end (14) of said body (12) is rectangular.
- The automotive headlamp (30) of claim 2 wherein said lens (34) is a projection lens.
- The automotive headlamp (30) of claim 3 wherein said light emitting diodes (24) are mounted in housings (35) and said housings (35) are mounted upon a heat sink (36).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US62093304P | 2004-10-21 | 2004-10-21 | |
US11/121,230 US7618171B2 (en) | 2004-10-21 | 2005-05-03 | Light emitting diode module for automotive headlamp |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1653150A1 EP1653150A1 (en) | 2006-05-03 |
EP1653150B1 true EP1653150B1 (en) | 2008-04-30 |
Family
ID=35501295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05022759A Not-in-force EP1653150B1 (en) | 2004-10-21 | 2005-10-19 | Light emitting diode module for automotive headlamp |
Country Status (6)
Country | Link |
---|---|
US (1) | US7618171B2 (en) |
EP (1) | EP1653150B1 (en) |
JP (1) | JP2006120640A (en) |
AT (1) | ATE393898T1 (en) |
CA (1) | CA2512230A1 (en) |
DE (1) | DE602005006360T2 (en) |
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2005
- 2005-05-03 US US11/121,230 patent/US7618171B2/en not_active Expired - Fee Related
- 2005-07-15 CA CA002512230A patent/CA2512230A1/en not_active Abandoned
- 2005-10-19 AT AT05022759T patent/ATE393898T1/en not_active IP Right Cessation
- 2005-10-19 DE DE602005006360T patent/DE602005006360T2/en active Active
- 2005-10-19 EP EP05022759A patent/EP1653150B1/en not_active Not-in-force
- 2005-10-20 JP JP2005305829A patent/JP2006120640A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012049117A1 (en) * | 2010-10-11 | 2012-04-19 | Hella Kgaa Hueck & Co. | Lighting unit |
Also Published As
Publication number | Publication date |
---|---|
JP2006120640A (en) | 2006-05-11 |
DE602005006360T2 (en) | 2009-06-18 |
EP1653150A1 (en) | 2006-05-03 |
DE602005006360D1 (en) | 2008-06-12 |
US7618171B2 (en) | 2009-11-17 |
US20060087861A1 (en) | 2006-04-27 |
ATE393898T1 (en) | 2008-05-15 |
CA2512230A1 (en) | 2006-04-21 |
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